[time-nuts] Loran-C & French Clocks

phil fortime at bellsouth.net
Wed Mar 18 06:11:41 EDT 2009


----- Original Message ----- 
From: "Magnus Danielson" <magnus at rubidium.dyndns.org>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Tuesday, March 17, 2009 7:36 PM
Subject: Re: [time-nuts] Loran-C & French Clocks


> Arnold,
>
> Arnold Tibus skrev:
>> Magnus and all,
>>
>> interestlingly the discussion about GMT seem to be a never ending
>> story, all over the world. As I know GMT was already renamed  in
>> the year 1925 ( or 1928 acc. other source ) to UT and
>> "universal time coordinated" (U T C) (that) is standard since
>> January 1, 1972. acc. "About the Time" :
>>
>> http://www.fai.org/astronautics/time.asp ,
>> look into the short overview to this history.
>>
>> "Does anyone know the exact difference between GMT and UTC?"
>> - this question seem to be already very old, Magnus.
>
> Um. That's not the question I am asking.
>
>> Richard B. Langley wrote a summary trying to give the right
>> answer with "A Few Facts Concerning GMT, UT, and the RGO ".
>>
>> His article can be found here:
>> http://www.apparent-wind.com/gmt-explained.html
>>
>> It summarizes:
>> "The Greenwich mean time, GMT, has today only an historical
>> interest. It has been abandoned since the thirties for successively
>>  the T U 1, the T U 2 and finally, in 1972, for the much more regular
>> universal time coordinated, U T C, that must be used
>> for all present use." !
>>
>> That is what I thought as well quite a while.
>> But I had to change ever so often all kind of scientific and
>> technical units, and I see the need to adopt it, I am sure we have
>> to be open for more steps into the future. Learning will never end...!
>
> You brings me no new knowledge, only a few more links, which I suspect
> repeats what my sources already says to me.
>
> I already know what GMT is in the several senses it is. For me it is
> clearly not UTC, except for the GMT transmissions done by BBC.
>
> I object to the use of GMT when it should say UTC, they should not be
> used interchangeably when talking about international time.
>
> The question I am asking is really about which is the time-scale
> accepted for national time in various countries.
>
> So far:
>
> UTC based: France, Sweden
> GMT based (UT1?): Great Brittian, Denmark
>
> I suspect several countries (such as US, Germany etc. etc) to be UTC
> based, but I do not know for sure.
>
> As you see, this is a quite different question then asking about "what
> is GMT" or "what timezone is country X".
>
> Cheers,
> Magnus


This will answers all the questions.
http://en.wikipedia.org/wiki/GMT
. 





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